NEED INVERTER CIRCUIT HELP

Discussion in 'General Electronics Chat' started by magnetman12003, May 25, 2015.

  1. magnetman12003

    Thread Starter Active Member

    May 10, 2008
    31
    0
    I wish to find a circuit to use that should have a variable INPUT of 20-400 volts DC. The OUTPUT must be a steady 27.2 volts AC. I must also be able to vary or control the OUTPUT amperage.

    Any help will be greatly appreciated.
     
  2. Hypatia's Protege

    Distinguished Member

    Mar 1, 2015
    2,800
    1,237
    Please be advised that these requirements are inconsistent... For a given load: dependance
    of one parameter implies independence of the other...

    Best regards
    HP
     
  3. AnalogKid

    Distinguished Member

    Aug 1, 2013
    4,542
    1,251
    What is the load current range?
    Does the AC output have to be isolated from the DC input?
    Why do you need a 20:1 input range?

    ak
     
    Roderick Young likes this.
  4. uwed

    Member

    Mar 16, 2015
    64
    17
    upload_2015-5-26_8-7-30.png upload_2015-5-26_8-9-0.png

    With a simple H-bridge with PWM control (or hysteresis-control) like the one shown you can get AC output of varaible frequency and amplitude. You can easily extend it to three-phase AC. Replace the voltage source U.1 by a DC/DC-converter (simple boost?, insulation?, bi-directional power flow? --> more information needed). The AC-source U.2 could be an AC-grid (or a motor and/or generator if it would be three-phase).

    The AC-side current iout can be defined by your current control independently from the AC voltage U.2. The resulting current is sinusoidal plus a ripple, you can set phase and amplitude, but the frequency is the same as the AC-voltage frequency. The AC side current will follow iRef which you define according to your requirements. In case your AC-load is not a voltage source but e.g a resistor or inductor or current-source, you cannot control the output current (as already mentioned above).

    Please note that the simulation above is a quick & dirty demonstration, the control is not optimized at all!
     
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